Heat 0.5 tbsp olive oil in a skillet, sauté diced onion and ground beef until cooked.
Season beef with cumin powder and salt; remove from skillet.
Place a tortilla flat on a hot pan, sprinkle half with cheese and cooked beef, then fold over.
Cook with remaining olive oil for 2 minutes on each side until golden crisp and cheese melts.
Cut into triangles and serve warm.